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+// Copyright (c) 2001 Ronald Garcia, Indiana University (garcia@osl.iu.edu)
+// Andrew Lumsdaine, Indiana University (lums@osl.iu.edu).
+// Distributed under the Boost Software License, Version 1.0. (See accompany-
+// ing file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UTF8_CODECVT_FACET_HPP
+#define BOOST_UTF8_CODECVT_FACET_HPP
+
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
+// utf8_codecvt_facet.hpp
+
+// This header defines class utf8_codecvt_facet, derived fro 
+// std::codecvt<wchar_t, char>, which can be used to convert utf8 data in
+// files into wchar_t strings in the application.
+//
+// The header is NOT STANDALONE, and is not to be included by the USER.
+// There are at least two libraries which want to use this functionality, and
+// we want to avoid code duplication. It would be possible to create utf8
+// library, but:
+// - this requires review process first
+// - in the case, when linking the a library which uses utf8 
+//   (say 'program_options'), user should also link to the utf8 library.
+//   This seems inconvenient, and asking a user to link to an unrevieved 
+//   library is strange. 
+// Until the above points are fixed, a library which wants to use utf8 must:
+// - include this header from one of it's headers or sources
+// - include the corresponding .cpp file from one of the sources
+// - before including either file, the library must define
+//   - BOOST_UTF8_BEGIN_NAMESPACE to the namespace declaration that must be used
+//   - BOOST_UTF8_END_NAMESPACE to the code to close the previous namespace
+//   - declaration.
+//   - BOOST_UTF8_DECL -- to the code which must be used for all 'exportable'
+//     symbols.
+//
+// For example, program_options library might contain:
+//    #define BOOST_UTF8_BEGIN_NAMESPACE <backslash character> 
+//             namespace boost { namespace program_options {
+//    #define BOOST_UTF8_END_NAMESPACE }}
+//    #define BOOST_UTF8_DECL BOOST_PROGRAM_OPTIONS_DECL
+//    #include "../../detail/utf8/utf8_codecvt.cpp"
+//
+// Essentially, each library will have its own copy of utf8 code, in
+// different namespaces. 
+
+// Note:(Robert Ramey).  I have made the following alterations in the original
+// code.
+// a) Rendered utf8_codecvt<wchar_t, char>  with using templates
+// b) Move longer functions outside class definition to prevent inlining
+// and make code smaller
+// c) added on a derived class to permit translation to/from current
+// locale to utf8
+
+//  See http://www.boost.org for updates, documentation, and revision history.
+
+// archives stored as text - note these ar templated on the basic
+// stream templates to accommodate wide (and other?) kind of characters
+//
+// note the fact that on libraries without wide characters, ostream is
+// is not a specialization of basic_ostream which in fact is not defined
+// in such cases.   So we can't use basic_ostream<OStream::char_type> but rather
+// use two template parameters
+//
+// utf8_codecvt_facet
+//   This is an implementation of a std::codecvt facet for translating 
+//   from UTF-8 externally to UCS-4.  Note that this is not tied to
+//   any specific types in order to allow customization on platforms
+//   where wchar_t is not big enough.
+//
+// NOTES:  The current implementation jumps through some unpleasant hoops in
+// order to deal with signed character types.  As a std::codecvt_base::result,
+// it is necessary  for the ExternType to be convertible to unsigned  char.
+// I chose not to tie the extern_type explicitly to char. But if any combination
+// of types other than <wchar_t,char_t> is used, then std::codecvt must be
+// specialized on those types for this to work.
+
+#include <locale>
+// for mbstate_t
+#include <wchar.h>
+// for std::size_t
+#include <cstddef>
+
+#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+
+namespace std {
+    #if defined(__LIBCOMO__)
+        using ::mbstate_t;
+    #elif defined(BOOST_DINKUMWARE_STDLIB) && !defined(__BORLANDC__)
+        using ::mbstate_t;
+    #elif defined(__SGI_STL_PORT)
+    #elif defined(BOOST_NO_STDC_NAMESPACE)
+        using ::mbstate_t;
+        using ::codecvt;
+    #endif
+} // namespace std
+
+#if !defined(__MSL_CPP__) && !defined(__LIBCOMO__)
+    #define BOOST_CODECVT_DO_LENGTH_CONST const
+#else
+    #define BOOST_CODECVT_DO_LENGTH_CONST
+#endif
+
+// maximum lenght of a multibyte string
+#define MB_LENGTH_MAX 8
+
+BOOST_UTF8_BEGIN_NAMESPACE
+
+struct BOOST_UTF8_DECL utf8_codecvt_facet :
+    public std::codecvt<wchar_t, char, std::mbstate_t>  
+{
+public:
+    explicit utf8_codecvt_facet(std::size_t no_locale_manage=0)
+        : std::codecvt<wchar_t, char, std::mbstate_t>(no_locale_manage) 
+    {}
+protected:
+    virtual std::codecvt_base::result do_in(
+        std::mbstate_t& state, 
+        const char * from,
+        const char * from_end, 
+        const char * & from_next,
+        wchar_t * to, 
+        wchar_t * to_end, 
+        wchar_t*& to_next
+    ) const;
+
+    virtual std::codecvt_base::result do_out(
+        std::mbstate_t & state, const wchar_t * from,
+        const wchar_t * from_end, const wchar_t*  & from_next,
+        char * to, char * to_end, char * & to_next
+    ) const;
+
+    bool invalid_continuing_octet(unsigned char octet_1) const {
+        return (octet_1 < 0x80|| 0xbf< octet_1);
+    }
+
+    bool invalid_leading_octet(unsigned char octet_1)   const {
+        return (0x7f < octet_1 && octet_1 < 0xc0) ||
+            (octet_1 > 0xfd);
+    }
+
+    // continuing octets = octets except for the leading octet
+    static unsigned int get_cont_octet_count(unsigned   char lead_octet) {
+        return get_octet_count(lead_octet) - 1;
+    }
+
+    static unsigned int get_octet_count(unsigned char   lead_octet);
+
+    // How many "continuing octets" will be needed for this word
+    // ==   total octets - 1.
+    int get_cont_octet_out_count(wchar_t word) const ;
+
+    virtual bool do_always_noconv() const throw() { return false; }
+
+    // UTF-8 isn't really stateful since we rewind on partial conversions
+    virtual std::codecvt_base::result do_unshift(
+        std::mbstate_t&,
+        char * from,
+        char * /*to*/,
+        char * & next
+    ) const 
+    {
+        next = from;
+        return ok;
+    }
+
+    virtual int do_encoding() const throw() {
+        const int variable_byte_external_encoding=0;
+        return variable_byte_external_encoding;
+    }
+
+    // How many char objects can I process to get <= max_limit
+    // wchar_t objects?
+    virtual int do_length(
+        BOOST_CODECVT_DO_LENGTH_CONST std::mbstate_t &,
+        const char * from,
+        const char * from_end, 
+        std::size_t max_limit
+#if BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(600))
+        ) const throw();
+#else
+        ) const;
+#endif
+
+    // Largest possible value do_length(state,from,from_end,1) could return.
+    virtual int do_max_length() const throw () {
+        return 6; // largest UTF-8 encoding of a UCS-4 character
+    }
+};
+
+BOOST_UTF8_END_NAMESPACE
+
+#endif // BOOST_UTF8_CODECVT_FACET_HPP